music has 2 distinct synonyms spread across 2 of its 5 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
an artistic form of auditory communication incorporating instrumental or vocal tones in a structured and continuous manner
Synonyms, antonyms and the broader and narrower relations for music come from Princeton University’s WordNet. Full sources and licences.
any agreeable (pleasing and harmonious) sounds
“he fell asleep to the music of the wind chimes”
musical activity (singing or whistling etc.)
“his music was his central interest”
(music) the sounds produced by singers or musical instruments (or reproductions of such sounds)